Attap is the translucent, gelatinous, immature fruits of the Nippa Palm tree and is a popular dessert ingredient in Thailand, Malaysia and Singapore.

According to Wikipedia, the Nippa Palm (Nypa) is the only palm that is considered to be a mangrove palm. Mangroves are trees and shrubs that grow in saline coastal habitats in the tropics and subtropics and are important for the bio-diversity of coastlines